This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Hierdie gesprek is in die argief. Vra asseblief 'n nuwe vraag as jy hulp nodig het.

550 5.0.350 Remote server returned an error -> 500 SMTP connection violates RFC5322 2.1.1 rule of 1000 characters per line. Fix your mailer.

  • 2 antwoorde
  • 0 hierdie probleem
  • 7 views
  • Laaste antwoord deur Robert UHRIK

more options

Hi folks. Again is here the annoying problem - cannot send messages...

Thunderbird 102.4.0 (32-bit version)

Receiving server response:

550 5.0.350 Remote server returned an error -> 500 SMTP connection violates RFC5322 2.1.1 rule of 1000 characters per line. Fix your mailer.

Is there any solution ?

Thank You.

Hi folks. Again is here the annoying problem - cannot send messages... Thunderbird 102.4.0 (32-bit version) Receiving server response: 550 5.0.350 Remote server returned an error -> 500 SMTP connection violates RFC5322 2.1.1 rule of 1000 characters per line. Fix your mailer. Is there any solution ? Thank You.

All Replies (2)

more options

I have TB 102.4.0 (64-bit) and I just tested sending a message with a single line of 1100 characters with no line break and it got sent successfully.

Are you using any add-ons?

more options

sorry for the long delay, was off...

since then, the problem wanished... or I have not used reply-to, but created new blank message instead to continue the conversation which caused problems...

My add-ons are - see picture...